Body Fluids and CirculationMedium
Question
Rhythmic heart beat is maintained by a highly specialized excitatory and conductive system. The correct sequence of events will be
Options
A.atrio-ventricular node - bundle of His - sino-atrio node - network of Purkinje fibers
B.network of Punkinje fibre-atrio - ventricular node - sino-atrio node -bundle of His
C.atrio-ventricular node - sino-atrio node- bundle of His - Purkinje fibres
D.sino-atrial node - atrio-ventricular node - bundle of His - Purkinje fibres
Solution
- The nodal musculature has the ability to generate action potentials without any external stimuli, i.e., it is autoexcitable. However, the number of action potentials that could be generated in a minute vary at different parts of the nodal system. The SAN can generate the maximum number of action potentials, i.e., 70-75 min–1, and is responsible for initiating and maintaining the rhythmic contractile activity of the heart
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